I want to bind my application.properties into a class automatically by using @ConfigurationProperties annotation. First, I tried with @Value annotation and was able to inject property values into class variables. However, @ConfigurationProperties did not inject properties into values.
my application.properties:
spring.jpa.show-sql=false
my.url=my_url
my.name=muatik
application.java
package com.muatik;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.ApplicationContext;
@SpringBootApplication
public class Application {
public static void main(String[] args) {
final ApplicationContext ctx = SpringApplication.run(Application.class, args);
final ConfigBinder confs = ctx.getBean(ConfigBinder.class);
System.out.println(confs.getUrl());
System.out.println(confs.getName());
}
}
ConfigBinder.java
package com.muatik;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.stereotype.Component;
@Component
@ConfigurationProperties(prefix="my")
public class ConfigBinder {
@Value("${my.name}")
private String name;
private String url; // expected to be filled automatically
public String getUrl() {
return this.url;
}
public String getName() {
return this.name;
}
}
output:
...
2017-01-18 15:19:29.720 INFO 4153 --- [ main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat started on port(s): 8080 (http)
2017-01-18 15:19:29.724 INFO 4153 --- [ main] com.muatik.Application : Started Application in 4.212 seconds (JVM running for 4.937)
null
muatik
What is the wrong with this implementation?
edit and solution : possible duplication: Spring Boot @ConfigurationProperties not retrieving properties from Environment
I found that I missed the setters in ConfigBinder. After adding them, it works now.
You need to remove @Component from you properties class and add setters because standard bean property binding is used by @ConfigurationProperties
:
@ConfigurationProperties(prefix="my")
public class ConfigBinder {
private String name;
private String url; // expected to be filled automatically
public String getUrl() {
return this.url;
}
public String getName() {
return this.name;
}
public void setName(String name) {
this.name = name;
}
public void setUrl(String url) {
this.url = url;
}
}
And add @EnableConfigurationProperties to your main class:
@SpringBootApplication
@EnableConfigurationProperties(ConfigBinder.class)
public class Application {
public static void main(String[] args) {
final ApplicationContext ctx = SpringApplication.run(Application.class, args);
final ConfigBinder confs = ctx.getBean(ConfigBinder.class);
System.out.println(confs.getUrl());
System.out.println(confs.getName());
}
}
The main problem is that you do not have setters. When you put setters to ConfigBuilder works fine. The ConfigBuilder must be like this
@Component
@ConfigurationProperties(prefix="my")
public class ConfigBinder {
private String name;
private String url;
// Getters and Setters !!!
}
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